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Revert "iommu: Add quirk for Intel graphic devices in map_sg"

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This reverts commit 65f746e828.

As commit 8a473dbadc ("drm/i915: Fix DMA mapped scatterlist walks") and
commit 934941ed5a ("drm/i915: Fix DMA mapped scatterlist lookup") fixed
the DMA scatterlist limitations in the i915 driver, remove this temporary
workaround.

Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Tom Murphy <murphyt7@tcd.ie>
Cc: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20201231005323.2178523-4-baolu.lu@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Lu Baolu 2020-12-31 08:53:22 +08:00 committed by Will Deacon
parent 1efd17e7ac
commit 4df7b2268a
1 changed files with 0 additions and 27 deletions
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27
drivers/iommu/dma-iommu.c
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@ -863,33 +863,6 @@ static int __finalise_sg(struct device *dev, struct scatterlist *sg, int nents,
unsigned int cur_len = 0, max_len = dma_get_max_seg_size(dev);
int i, count = 0;
/*
* The Intel graphic driver is used to assume that the returned
* sg list is not combound. This blocks the efforts of converting
* Intel IOMMU driver to dma-iommu api's. Add this quirk to make the
* device driver work and should be removed once it's fixed in i915
* driver.
*/
if (IS_ENABLED(CONFIG_DRM_I915) && dev_is_pci(dev) &&
to_pci_dev(dev)->vendor == PCI_VENDOR_ID_INTEL &&
(to_pci_dev(dev)->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
for_each_sg(sg, s, nents, i) {
unsigned int s_iova_off = sg_dma_address(s);
unsigned int s_length = sg_dma_len(s);
unsigned int s_iova_len = s->length;
s->offset += s_iova_off;
s->length = s_length;
sg_dma_address(s) = dma_addr + s_iova_off;
sg_dma_len(s) = s_length;
dma_addr += s_iova_len;
pr_info_once("sg combining disabled due to i915 driver\n");
}
return nents;
}
for_each_sg(sg, s, nents, i) {
/* Restore this segment's original unaligned fields first */
unsigned int s_iova_off = sg_dma_address(s);